Re: [CVE-2017-17719] Cross-Site Scripting (XSS) vulnerability in WordPress Concours Plugin

[Ryan Dewhurst <ryandewhurst () gmail com>]

Hi,

If you email plugins-at-wordpress.org they will attempt to contact the
author, and if unable to, they usually remove the plugin from their
repository.

Thanks,
Ryan

On Tue, Dec 19, 2017 at 6:01 PM, <nicolas.buzy-debat () orange com> wrote:

> Product: WordPress Concours Plugin - https://wordpress.org/plugins/
> wp-concours/
> Vendor: Olyos
> Tested version: 1.1
> CVE ID: CVE-2017-17719
>
> ** CVE description **
> A cross-site scripting (XSS) vulnerability in the wp-concours plugin
> through 1.1 for WordPress allows remote attackers to inject arbitrary web
> script or HTML via the result_message parameter to
> includes/concours_page.php.
>
> ** Technical details **
> In wp-concours/includes/concours_page.php:18, $_REQUEST['result_message']
> is stored in the $message_str variable without proper sanitization. This
> variable is then echoed back to user on line 28.
>
> Vulnerable code:
> https://plugins.trac.wordpress.org/browser/wp-concours/trunk/includes/
> concours_page.php#L18
>
> ** Proof of Concept **
> http://<host>/wordpress/wp-admin/admin.php?page=concours&
> result_message=<script>alert(document.cookie);</script>
>
> ** Solution **
> No fix available yet.
>
> ** Timeline **
> 28/09/2017: vendor contacted; vendor asks for technical report
> 06/10/2017: requested an update regarding the fix; vendor says in November
> 05/12/2017: sent an e-mail to warn about the release of that advisory; no
> reply
> 19/12/2017: report published
>
> ** Credits **
> Vulnerability discovered by Nicolas Buzy-Debat working at Orange
> Cyberdefense Singapore (CERT-LEXSI).
>
> --
> Best Regards,
>
> Nicolas Buzy-Debat
> Orange Cyberdefense Singapore (CERT-LEXSI)
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